Introduction to writing spiders and agents
Downloading files with PHP
       
   1. Local file
        $fp = fopen ("/home/system_usr/file.txt", "r");
       
   2. Web page
        $fp = fopen ("http://www.someplace.com/", "r");
       
   3. FTP
        $fp = fopen ("ftp://user:password@someplace.com/", "r");
        $fp = fopen ("ftp://user:password@someplace.com/", "w");